Leviticus 25:33-34

LXX2012(i) 33 And if any one shall redeem a house of the Levites, then shall their sale of the houses of their possession go out in the release; because the houses of the cities of the Levites are their possession in the midst of the children of Israel. 34 And the lands set apart for their cities shall not be sold, because this is their perpetual possession.